diff --git a/package-lock.json b/package-lock.json
index 33b90bc5..a0235d58 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6,10 +6,10 @@
   "packages": {
     "": {
       "name": "csso",
-      "version": "5.0.4",
+      "version": "5.0.5",
       "license": "MIT",
       "dependencies": {
-        "css-tree": "~2.2.0"
+        "css-tree": "^3.2.1"
       },
       "devDependencies": {
         "c8": "^7.10.0",
@@ -173,6 +173,7 @@
       "version": "0.5.0",
       "resolved": "https://registry.npmjs.org/@humanwhocodes/config-array/-/config-array-0.5.0.tgz",
       "integrity": "sha512-FagtKFz74XrTl7y6HCzQpwDfXP0yhxe9lHLD1UZxjvZIcbyRz8zTFF/yYNfSfzU414eDwZ1SrO0Qvtyf+wFMQg==",
+      "deprecated": "Use @eslint/config-array instead",
       "dev": true,
       "dependencies": {
         "@humanwhocodes/object-schema": "^1.2.0",
@@ -187,6 +188,7 @@
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/@humanwhocodes/object-schema/-/object-schema-1.2.1.tgz",
       "integrity": "sha512-ZnQMnLV4e7hDlUvw8H+U8ASL02SS2Gn6+9Ac3wGGLIe7+je2AeAOxPY+izIPJDfFDb7eDjev0Us8MO1iFRN8hA==",
+      "deprecated": "Use @eslint/object-schema instead",
       "dev": true
     },
     "node_modules/@istanbuljs/schema": {
@@ -500,16 +502,15 @@
       }
     },
     "node_modules/css-tree": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/css-tree/-/css-tree-2.2.0.tgz",
-      "integrity": "sha512-7y32czN0VBL8WkevhC/mrHnoHOmQaJ1Wvp8sjRuTz6/n9cjL83jQaUru2MvP7kzjpGVwrSy5CE4XyQObWGIHQQ==",
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/css-tree/-/css-tree-3.2.1.tgz",
+      "integrity": "sha512-X7sjQzceUhu1u7Y/ylrRZFU2FS6LRiFVp6rKLPg23y3x3c3DOKAwuXGDp+PAGjh6CSnCjYeAul8pcT8bAl+lSA==",
       "dependencies": {
-        "mdn-data": "2.0.28",
-        "source-map-js": "^1.0.1"
+        "mdn-data": "2.27.1",
+        "source-map-js": "^1.2.1"
       },
       "engines": {
-        "node": "^10 || ^12.20.0 || ^14.13.0 || >=15.0.0",
-        "npm": ">=7.0.0"
+        "node": "^10 || ^12.20.0 || ^14.13.0 || >=15.0.0"
       }
     },
     "node_modules/debug": {
@@ -955,6 +956,7 @@
       "version": "7.32.0",
       "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.32.0.tgz",
       "integrity": "sha512-VHZ8gX+EDfz+97jGcgyGCyRia/dPOd6Xh9yPv8Bl1+SoaIwD+a/vlrOmGRUyOYu7MwUhc7CxqeaDZU13S4+EpA==",
+      "deprecated": "This version is no longer supported. Please see https://eslint.org/version-support for other options.",
       "dev": true,
       "dependencies": {
         "@babel/code-frame": "7.12.11",
@@ -1288,6 +1290,7 @@
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/glob/-/glob-7.2.0.tgz",
       "integrity": "sha512-lmLf6gtyrPq8tTjSmrO94wBeQbFR3HbLHbuyD69wuyQkImp2hWqMGB47OX65FBkPffO641IP9jWa1z4ivqG26Q==",
+      "deprecated": "Old versions of glob are not supported, and contain widely publicized security vulnerabilities, which have been fixed in the current version. Please update. Support for old versions may be purchased (at exorbitant rates) by contacting i@izs.me",
       "dev": true,
       "dependencies": {
         "fs.realpath": "^1.0.0",
@@ -1402,6 +1405,7 @@
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/inflight/-/inflight-1.0.6.tgz",
       "integrity": "sha1-Sb1jMdfQLQwJvJEKEHW6gWW1bfk=",
+      "deprecated": "This module is not supported, and leaks memory. Do not use it. Check out lru-cache if you want a good and tested way to coalesce async requests by a key value, which is much more comprehensive and powerful.",
       "dev": true,
       "dependencies": {
         "once": "^1.3.0",
@@ -1652,9 +1656,9 @@
       }
     },
     "node_modules/mdn-data": {
-      "version": "2.0.28",
-      "resolved": "https://registry.npmjs.org/mdn-data/-/mdn-data-2.0.28.tgz",
-      "integrity": "sha512-aylIc7Z9y4yzHYAJNuESG3hfhC+0Ibp/MAMiaOZgNv4pmEdFyfZhhhny4MNiAfWdBQ1RQ2mfDWmM1x8SvGyp8g=="
+      "version": "2.27.1",
+      "resolved": "https://registry.npmjs.org/mdn-data/-/mdn-data-2.27.1.tgz",
+      "integrity": "sha512-9Yubnt3e8A0OKwxYSXyhLymGW4sCufcLG6VdiDdUGVkPhpqLxlvP5vl1983gQjJl3tqbrM731mjaZaP68AgosQ=="
     },
     "node_modules/minimatch": {
       "version": "3.0.4",
@@ -1993,6 +1997,7 @@
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
       "integrity": "sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==",
+      "deprecated": "Rimraf versions prior to v4 are no longer supported",
       "dev": true,
       "dependencies": {
         "glob": "^7.1.3"
@@ -2094,9 +2099,9 @@
       }
     },
     "node_modules/source-map-js": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.0.1.tgz",
-      "integrity": "sha512-4+TN2b3tqOCd/kaGRJ/sTYA0tR0mdXx26ipdolxcwtJVqEnqNYvlCAt1q3ypy4QMlYus+Zh34RNtYLoq2oQ4IA==",
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
+      "integrity": "sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA==",
       "engines": {
         "node": ">=0.10.0"
       }
@@ -2807,12 +2812,12 @@
       }
     },
     "css-tree": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/css-tree/-/css-tree-2.2.0.tgz",
-      "integrity": "sha512-7y32czN0VBL8WkevhC/mrHnoHOmQaJ1Wvp8sjRuTz6/n9cjL83jQaUru2MvP7kzjpGVwrSy5CE4XyQObWGIHQQ==",
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/css-tree/-/css-tree-3.2.1.tgz",
+      "integrity": "sha512-X7sjQzceUhu1u7Y/ylrRZFU2FS6LRiFVp6rKLPg23y3x3c3DOKAwuXGDp+PAGjh6CSnCjYeAul8pcT8bAl+lSA==",
       "requires": {
-        "mdn-data": "2.0.28",
-        "source-map-js": "^1.0.1"
+        "mdn-data": "2.27.1",
+        "source-map-js": "^1.2.1"
       }
     },
     "debug": {
@@ -3567,9 +3572,9 @@
       }
     },
     "mdn-data": {
-      "version": "2.0.28",
-      "resolved": "https://registry.npmjs.org/mdn-data/-/mdn-data-2.0.28.tgz",
-      "integrity": "sha512-aylIc7Z9y4yzHYAJNuESG3hfhC+0Ibp/MAMiaOZgNv4pmEdFyfZhhhny4MNiAfWdBQ1RQ2mfDWmM1x8SvGyp8g=="
+      "version": "2.27.1",
+      "resolved": "https://registry.npmjs.org/mdn-data/-/mdn-data-2.27.1.tgz",
+      "integrity": "sha512-9Yubnt3e8A0OKwxYSXyhLymGW4sCufcLG6VdiDdUGVkPhpqLxlvP5vl1983gQjJl3tqbrM731mjaZaP68AgosQ=="
     },
     "minimatch": {
       "version": "3.0.4",
@@ -3886,9 +3891,9 @@
       }
     },
     "source-map-js": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.0.1.tgz",
-      "integrity": "sha512-4+TN2b3tqOCd/kaGRJ/sTYA0tR0mdXx26ipdolxcwtJVqEnqNYvlCAt1q3ypy4QMlYus+Zh34RNtYLoq2oQ4IA=="
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
+      "integrity": "sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA=="
     },
     "sprintf-js": {
       "version": "1.0.3",
diff --git a/package.json b/package.json
index ec838ecf..69aab2a2 100644
--- a/package.json
+++ b/package.json
@@ -58,7 +58,7 @@
     "hydrogen": "node --trace-hydrogen --trace-phase=Z --trace-deopt --code-comments --hydrogen-track-positions --redirect-code-traces --redirect-code-traces-to=code.asm --trace_hydrogen_file=code.cfg --print-opt-code bin/csso --stat -o /dev/null"
   },
   "dependencies": {
-    "css-tree": "~2.2.0"
+    "css-tree": "^3.2.1"
   },
   "devDependencies": {
     "c8": "^7.10.0",